. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 7. Four successive steps in the progress of an unusually active sperm- head after it had penetrated an , .+•*••-(., \-^.._••*•*>j: - •' . i"- -. •* '4 ;,':, ., - -V-i - T ; (J ' B -• -•' ': O B 1'4S" C 4'15" FIG. 8 FIG. 8. A spermatozoon which on entering an egg left its neck-piece outside the fertilization membrane. the fertilization membrane, broke away from its neck-piece which was left outside with the tail. Figs. 9 and 10 show the reactions of late arriving spermatozoa. Fig. 9
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 7. Four successive steps in the progress of an unusually active sperm- head after it had penetrated an , .+•*••-(., \-^.._••*•*>j: - •' . i"- -. •* '4 ;,':, ., - -V-i - T ; (J ' B -• -•' ': O B 1'4S" C 4'15" FIG. 8 FIG. 8. A spermatozoon which on entering an egg left its neck-piece outside the fertilization membrane. the fertilization membrane, broke away from its neck-piece which was left outside with the tail. Figs. 9 and 10 show the reactions of late arriving spermatozoa. Fig. 9 shows a spermatozoon which succeeded in passing through an already lifted fertilization membrane. During the process the cone changed shape and flattened out, while the fertilization membrane be- came appreciably indented. In Fig. 10 the spermatozoon reached the cone, A-C, but failed to enter. The fertilization membrane wrinkled and the cone formed accessory elevations, D—F, but, when the cone finally withdrew from the membrane, the spermatozoon was left out-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
Size: 2107px × 1186px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
